Electric storage battery



HANS EBARDT, 01'? SANTIAGO, CHILE, ASSIGNOR TO SOCIEDAD HIDRO-METALURGIlICA. F SANTIAGQ, CHILE, A CORPORATION OF CHILE.

ELECTRIC STORAGE BATTERY.

1x 0 Drawing.

To all whom it may concern:

Be it known that I, Hans Baron, citizen of Germany, residing at Santiago, Chile, have invented certain new and useful Im- 5 provements in Electric Storage Batteries, of

which the following is a specification.

With electric storage batteries it is mostessential, that a maximum output (in kilowatts) can be reached with a minimum lmweight of accumulator-cell.

The electric storage batteries in use (the lead as well as the Edison type of battery) contain holders for the active material, the manufacture of which is complicated and s costly, apart from the disadyantage that they add considerably to the dead weight of the cell. Besides, the plate-structure in a lead battery is very sensitive to extreme discharges or overcharges, and, at any rate, the ac plates only last for a,reasonable' length of time, when treated with very great care and under the conditions that all rules for their safe working are strictly observed. The types in vogue, however, only yield a discharge-current of an average strength of 0.7! amperes per square decimeter of electrode area.

It has'been shown that it is possible to considerably improve the output and life of storage batteries; to eliminate the use of independent holders; furthermore, to raise the strength of the dischar 'e-current up to 1.0 and 2.0 ampercs per square decimcter of electrode-area; and finally, to raise the capacity, (i. e. kilowatt-yield in relation to cell-weight) obtaining an increase of about ll by employing a new electrolyte and suitable electrodes, adequately arranged in lmrixontal position.

As electrolyte, solutions of the perchlorates of those metals can be employed, which, when in a pure state and under normal conditions, are inert with respect to perchloric acid as w'ell as to its salts. Analogously, as suitable electrodes are made of metals or metallic alloys, which are not attacked by perchloric acid or its salts, as for instance, of ferro-siliconalloys.

If, for instance, solutions of perchlorate 5 of lead or copper are employed, as much lead oxide is put on to the positive electrode Specification of Ietters I atent.

Patented Aug. 8,, 19223.

vat) as corresponds to the metal the negative electrode enter the solution and 'lead oxide is regenerated at the positive electrode, in the same proportion.

In this procedure, a discharge current of an extremely high intensity is produced, i. e.

of 2.0 amperes per square decimeter of electrode-area. i

The following example may. serve as an illustration of the above: 7

Into a vat With a horizontal bottom-electrode of term-silicon or into a bowl-shaped vessel made of the same material, a solution of perchlorate. of lead or copper is introduced, of 'a concentration of 10%- of lead or 13% of copper, respectively. Then, a certain quantity of lead-oxide corresponding .to-the metal content and volume of the electrolyte is put on to the bottom-electrode.

After introducing the negative electrode, which may be made of lead, copper or ferrosilicon, the accumulator thus constructed, is charged, employing a current-density of L'i ampere per .squaredecimeter of electrode area.

Claims:

1. An electrolyte for storage batteries which consists of a metallic perchlorate so lution.

2. An electrolyte for storage batteries which consists of a solution of perchlorate of lead.

til

3. An electric storage battery comprising an electrolyte ot' a perchlorate solution, a negative electrode of a ferro-silicon alloy and a positive electrode having a coating of lead oxide.

In testimony whereof I aflix my'signature.

HANS BARDT. \Vitnesses WALTER J.'TINGLE, R. MARNEGKER. 

